Actinide Separation Science and Technology

Nash, Kenneth L.; Madic, C.; Mathur, J. N.; Lacquement, Jeéroôme

doi:10.1007/978-94-007-0211-0_24

Cited by 27 publications

(24 citation statements)

References 452 publications

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“…The redox properties of the element play a pivotal role in neptunium chemistry as it conventionally exhibits five oxidation states in compounds, from +3 to +7. 18 Recently, we reported that a formally Np II complex Np(L Ar )(dme) supported by L Ar , the trans -calix[2]benzene[2]pyrrole is accessible; black solutions were sufficiently stable (up to 90 minutes) for spectroscopic analyses but crystals were too small for single crystal diffraction analyses. 4 Somewhat surprisingly, given the increased stability of the Np III oxidation state compared to U III , this work was also the first to report single crystal structural studies on organometallic Np III complexes.…”

Section: Introductionmentioning

confidence: 99%

Reduction chemistry of neptunium cyclopentadienide complexes: from structure to understanding

et al. 2017

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Section: Introductionmentioning

confidence: 99%

Reduction chemistry of neptunium cyclopentadienide complexes: from structure to understanding

et al. 2017

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“…Different radionuclides are often generated together, so it is essential to optimize isotope separation for studying highpurity samples. The separation of elements can be dependent on their concentrations, thus further complicating separation (Nash et al, 2006). Moreover, many of the isotopes of interest, like 229 Pa, are understudied due to their relative scarcity and difficulty in handling.…”

Section: Radiochemistrymentioning

confidence: 99%

Opportunities for Fundamental Physics Research with Radioactive Molecules

Arrowsmith-Kron¹,

Athanasakis-Kaklamanakis²,

Au³

et al. 2023

Preprint

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Molecules containing short-lived, radioactive nuclei are uniquely positioned to enable a wide range of scientific discoveries in the areas of fundamental symmetries, astrophysics, nuclear structure, and chemistry. Recent advances in the ability to create, cool, and control complex molecules down to the quantum level, along with recent and upcoming advances in radioactive species production at several facilities around the world, create a compelling opportunity to coordinate and combine these efforts to bring precision measurement and control to molecules containing extreme nuclei. In this manuscript, we review the scientific case for studying radioactive molecules, discuss recent atomic, molecular, nuclear, astrophysical, and chemical advances which provide the foundation for their study, describe the facilities where these species are and will be produced, and provide an outlook for the future of this nascent field.

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“…For a subsequent transmutation or vitrification as the strategy to ‘fix’ the long-lived minor actinides, it is imperative to separate the trivalent lanthanides due to factors such as: (i) lanthanides have a very high neutron absorption cross section and hence, can act as neutron poison; (ii) lanthanides separate out as a different phase making the vitrification process inefficient. However, the separation of the lanthanides from the trivalent actinides has been a quite challenging task due to their similar chemical and physical behavior . A large number of review articles have appeared on the separation of trivalent lanthanides and actinides, which dwell on the selective complexation of either the trivalent lanthanides with hard donor (e.g., O atoms) ligands or that of the trivalent actinides with soft donor ligands (e.g., S or N atoms). − …”

Section: Introductionmentioning

confidence: 99%

Unassisted and Efficient Actinide/Lanthanide Separation with Pillar[5]arene-Based Picolinamide Ligands in Ionic Liquids

Cai

Ansari

Yuan

et al. 2023

Ind. Eng. Chem. Res.

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Actinide/lanthanide separation is crucial for the development of nuclear industries, while this is largely hindered by their similar chemical and physical properties. In this work, we report solvent extraction systems comprising different pillar[5]arene-based picolinamide ligands with various substituted groups and the ionic liquid, C 4 mimNTf 2 , for efficient actinide/lanthanide separation from acidic solutions. Changing the pyridine nitrogen basicity by substituting the chlorine group (−I effect) or methoxy group (+I effect) at the para-position changes the extraction performance of the ligands substantially. The chlorine group gave negative extraction performance while the methoxy group enhanced the metal ion extraction ability by three orders of magnitude. Extraction kinetics for Am 3+ and Eu 3+ was fast, and equilibrium distribution values were reached within 15 min with all three ligands. Slope analyses suggested that the stoichiometry of the extracted complexes of Am 3+ and Eu 3+ with the three ligands is M/L 2/1, and each metal ion is extracted following the cation exchange mechanism involving the transfer of three C 4 mim + cations into the aqueous phase. Fluorescence spectroscopic investigation indicated that the extracted complexes were much distorted and ligands were directly coordinated to the metal ion with no sign of water molecules in the primary coordination sphere. The possible complexation structures of the ligands and the Eu 3+ ion were optimized by density functional theory calculations, which confirmed that the differences in the extraction ability of the ligands originate from different bonding strength between pyridine nitrogens and metal ions.

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Actinide Separation Science and Technology

Cited by 27 publications

References 452 publications

Reduction chemistry of neptunium cyclopentadienide complexes: from structure to understanding

Reduction chemistry of neptunium cyclopentadienide complexes: from structure to understanding

Opportunities for Fundamental Physics Research with Radioactive Molecules

Unassisted and Efficient Actinide/Lanthanide Separation with Pillar[5]arene-Based Picolinamide Ligands in Ionic Liquids

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